Description: This crustose lichen will be found in the garden of almost every home on wall tops, patio tiles, pond stonework, rockeries and the like and is one of Ireland’s most cosmopolitan species. It has a cracked or scurfy grey-green thallus peppered with dull-orange (never bright-orange), mostly convex, unevenly-shaped discs. At a standing distance from the ground the species may appear little more than a dull stain. Common on limestone, mortar and other calcareous substrata.

Key Identification Features:

• Cracked or scurfy, dirty grey-green thallus
• Sickly-looking, dull-orange convex discs.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Protoblastenia rupestris at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Protoblastenia rupestris at iNaturalist World Species Observations database.